There's no way to stop the calls from being initiated.  Invest in a call blocker and DO NOT pick up on call numbers you do not recognize.  Callers are most likely overseas and change numbers a lot.

I've gotten several calls from 201 002 0100 and no one replies when I say "hello".........  tried calling the number back and it's not a number, a recording shares it's not a valid number...........

I put this number on the auto reject list that comes with my phone. Whenever I answered it, no one said anything. Tired of wasting my time answering calls from this number.

When I answer  they say nothing

did not answer and they left no message